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Science China Earth Sciences

, Volume 61, Issue 7, pp 940–950 | Cite as

Impact of anthropogenic drivers on subaqueous topographical change in the Datong to Xuliujing reach of the Yangtze River

  • Shuwei Zheng
  • Heqin Cheng
  • Shengyu Shi
  • Wei Xu
  • Quanping Zhou
  • Yuehua Jiang
  • Fengnian Zhou
  • Minxiong Cao
Research Paper

Abstract

Changes of subaqueous topography in shallow offshore water pose safety risks for embankments, navigation, and ports. This study conducted measurements of subaqueous topography between Datong and Xuliujing in the Yangtze River using a SeaBat 7125 multi-beam echo sounder, and the channel change from 1998 to 2013 was calculated using historical bathymetry data. The study revealed several important results: (1) the overall pattern of changes through the studied stretch of the river was erosion–deposition–erosion. Erosion with a volume 700×106 m3 occurred in the upper reach, deposition of about 204×106 m3 occurred in the middle reach, and erosion of about 602×106 m3 occurred in the lower reach. (2) Dunes are the most common microtopographic feature, accounting for 64.3% of the Datong to Xuliujing reach, followed by erosional topography and flat river topography, accounting for 27.6% and 6.6%, respectively. (3) Human activities have a direct impact on the development of the microtopography. For instance, the mining of sand formed holes on the surface of dunes with lengths of 20–35 m and depths of 3–5 m. We concluded that the overall trend of erosion (net erosion volume of 468×106 m3) occurred in the study area mainly because of the decreased sediment discharge following the closure of the Three Gorges Dam. However, other human activities were also impact factors of topographic change. Use of embankments and channel management reduced channel width, restricted river meandering, and exacerbated the erosion phenomenon.

Keywords

Subaqueous topographical Human activities Multi-beam echo sounder High resolution Yangtze River 

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Notes

Acknowledgements

We thank the two reviewers for their insightful comments and contributions. Thanks go to Wu Shuaihu, Lu Xuejun, Luo Zhang, Cai Bing, Luo Zhifa, Zhan Jian, Dong Weili and Xu Houyong. This study was financially supported by the National Natural Science Foundation of China (Grant Nos. 51761135023 & 41476075) and the China Geological Survey (Grant No. DD20160246).

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shuwei Zheng
    • 1
  • Heqin Cheng
    • 1
  • Shengyu Shi
    • 1
  • Wei Xu
    • 1
  • Quanping Zhou
    • 2
  • Yuehua Jiang
    • 2
  • Fengnian Zhou
    • 3
  • Minxiong Cao
    • 4
  1. 1.State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghaiChina
  2. 2.Nanjing Geological Survey CenterChina Geological SurveyNanjingChina
  3. 3.Yangtze River Water Resources CommissionYangtze River Hydrology and Water Resources Survey BureauShanghaiChina
  4. 4.Nanjing Hydraulic Research InstituteState Key Laboratory of Hydrology-Water Resources and Hydraulic EngineeringNanjingChina

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